Can't charge the battery of my Walkman Player
- If model-specific information is required to complete any of the steps in this solution, refer to the operating instructions supplied with the product. If you have an older model that does not connect via USB, the steps that mention USB connection will not apply.
- For NW-A20/A30/A40/A50/A100/A300/WM1/ZX100/ZX300/ZX500/ZX700 Series, refer to the following article: The Walkman battery cannot be charged.
Note: Because each step represents a possible solution to this issue, check the device status after completing each step.
Select the type of your Walkman:
Devices with a Display
1. Connect the Walkman to a computer or AC power supply, and check the display of the Walkman.
The battery indicator is displayed on the screen. Nothing is display on the Walkman (the screen of the Walkman is black)2. Check the USB cable or AC power adapter connection.
If you are using a USB cable If you are using an AC power adapter Notes:- Charge the battery in an ambient temperature of between 5 ºC to 35 ºC (41 ºF to 95 ºF). If you try to charge the battery outside of this temperature range, the battery indicator may blink, and charging cannot be performed.
- The number of times a battery can be recharged before it needs to be replaced is approximately 500 times.
- This number may vary slightly, depending on the conditions under which you use the player. If you do not intend to use the player for over six months, charge the battery at least once during this time to maintain battery performance.
Reset (Restart) the Walkman
If the battery still won't charge and it is replaceable, try a new battery.  Go to Parts and Accessories. 
If the battery isn't replaceable, repair may be required.  Go to Product Repair. 
Devices without a Display
1. Connect the Walkman to a computer or AC power supply, and check the lamp of the Walkman.
The operation lamp (OPR) is lit up. The operation lamp is turned off.2. Check the USB cable or AC power adapter connection.
If you are using a USB cable If you are using an AC power adapter Notes:- Charge the battery in an ambient temperature of between 5 ºC to 35 ºC (41 ºF to 95 ºF). If you try to charge the battery outside of this temperature range, the battery indicator may blink, and charging cannot be performed.
- The number of times a battery can be recharged before it needs to be replaced is approximately 500 times.
- This number may vary slightly, depending on the conditions under which you use the player. If you do not intend to use the player for over six months, charge the battery at least once during this time to maintain battery performance.
3. Check the terminals of the Walkman
If the terminals are not connected to each other properly, the Walkman may not be able to charge. Make sure to keep the Walkman terminals clean.
For waterproof Walkman model, wet a soft brush such as toothbrush with water and wipe the moisture off, for details check the following video:
Reset (Restart) the Walkman
If the problem persists even after you have reset the Walkman, the Walkman or USB cable needs to be inspected and repaired.  Go to Product Repair.